This pack of 4 Self Adhesive Round Electrodes is the smaller of two sizes available in this section of the website, measuring 30mm in diameter.These Self Adhesive Electrodes are suitable for all TENS, STIM, FES and EMG applications, making them highly versatile. Designed with a unique, low allergy gel helping to reduce skin irritation. These electrodes give an even current distribution eliminating hot spots and making these extremely comfortable for the user. Self Adhesive Round Electrodes offer optimal conductivity and excellent adherence to the skin even after multiple uses.